<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
    <style>

        .box{
            width: 100%;
            height: auto;
            flex-wrap: wrap;
            display: flex;
        }
        .box1{
            width: 100%;
            height: 100px;
            background-color: brown;
        }
        .box2{
            width: 25%;
            height: 300px;
            background-color: blue;
        }
        .box3{
            width: 50%;
            height: 300px;
            background-color: yellow;
        }
        .box4{
            width: 25%;
            height: 300px;
            background-color: turquoise;
        }
        .box5{
            width: 100%;
            height: 200px;
            background-color: wheat;
        }
    </style>
<body>
    <div class="box">
        <div class="box1"></div>
        <div class="box2"></div> <div class="box3"></div> <div class="box4"></div>
        <div class="box5"></div>
    </div>
</body>
</html>